GR8835ACI [GRENERGY]
Green-Mode PWM Controller with Integrated Protections;
| 型号： | GR8835ACI |
| 厂家： | 
Grenergy Opto, lnc. |
| 描述： | Green-Mode PWM Controller with Integrated Protections |
| 文件： | 总14页 (文件大小：926K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GR8835A
Green-Mode PWM Controller with Integrated Protections
Features
Applications
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Current mode PWM
Switching AC/DC power adapter and battery
Very low startup current
charger
Under-voltage lockout (UVLO)
Non-audible-noise green-mode control
Programmable switching frequency
Cycle-by-cycle peak current limiting
Internal leading-edge blanking
Internal slope compensation
Internal 4ms soft start (Fs=65KHz)
VCC over voltage clamp
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Open-frame SMPS
Description
The GR8835A is a highly-integrated, low startup
current, current mode PWM controller with
Green-mode function. This function enables the
power supply to easily meet even the strictest
power conservation requirements. The integrated
functions also include the leading-edge blanking
Gate output voltage clamp
Soft driving for reducing EMI
Over-voltage protection (OVP) on VCC Pin
Over-load protection (OLP)
of
the current sensing, internal slope
compensation, cycle-by-cycle peak current
limiting and soft start. OLP, OCP and OVP provide
protection performance for fault conditions. To
protect the external power MOSFET from being
damaged by supply over voltage, the GR8835A
gate voltage is clamped about 13V.
Over-current protection (OCP) on CS Pin
300mA driving capability
Meet the standard of Green Partner, SONY
SS-00259
The GR8835A improves the performance and
reduces the cost of power supplies. It is with both
8-pin DIP and 6-pin SOT-26 package.
Ordering and Marking Information
DIP-8
SOT-26
Grenergy OPTO Inc. reserves the right to make changes to improve reliability or manufacture ability without
notice, and advise customers to obtain the latest version of relevant information to verify before placing
orders.
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
1
GR8835A
Pin Configuration
Pin Description
Pin No.
Name
GND
COMP
RT
Function
1
2
3
4
5
6
Ground
Voltage feedback pin, by connecting a photo-coupler to control the duty cycle
Connecting a resistor to ground, this resistor determine the switching frequency
Current sense pin, connect to sense the MOSFET current
Power supply pin
CS
VCC
OUT
The output driver for driving the external MOSFET
Note: Pin No. is only for SOT-26 package.
Absolute Maximum Ratings
Supply Voltage VCC --------------------------------------------------------------------------------------------------------- 32V
COMP, RT, CS -------------------------------------------------------------------------------------------------------
0.3 ~ 7V
Junction temperature ----------------------------------------------------------------------------------------------------- 150
Operating ambient temperature ---------------------------------------------------------------------------------
Storage temperature range --------------------------------------------------------------------------------
40 ~ 85
65 ~ 150
SOT-26 package thermal resistance ------------------------------------------------------------------------------ 250 /W
Power dissipation (SOT-26, at Ambient Temperature = 85
Power dissipation (DIP-8, at Ambient Temperature = 85
)
----------------------------------------------- 250mW
---------------------------------------------------- 650mW
)
Lead temperature (All Pb Free Packages, Soldering, 10 sec) -------------------------------------------------- 260
ESD voltage protection, human body model -------------------------------------------------------------------------
3KV
ESD voltage protection, machine model ------------------------------------------------------------------------------ 250V
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
2
GR8835A
Recommended Operating Conditions
Item
Min.
11
Max.
25
Unit
V
Supply voltage VCC
Switching Frequency
50
130
KHz
Block Diagram
Low pass
Filter
UVLO
All Blocks
Internal Bias & Vref
15V/9V
Vref OK
VCC OK
EN
OVP
OLP
debounce
28V
60ms delay
Latch
Protection
3.6V
EN
RB
0.95V
LEB
CS open, 2ndary rectify diode short
OCP
0.9V
Slope compensation
Protection
RT_F
Driver
stage
Vbias
EN
Soft Start
R Q
S
Mode
select
OSC
RT
open/short
RT_F
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
3
GR8835A
Electrical Characteristics (T
A
= +25
unless otherwise stated, Vcc = 15.0V)
Parameter
Pin
Min.
Typ.
Max.
Unit
SUPPLY VOLTAGE
Startup current
5
5
5
8
20
uA
mA
mA
Operating current (with 1nF load on OUT pin), Vcomp = 0V
Operating current (with 1nF load on OUT pin), Vcomp = 2.5V
Operating current (with 1nF load on OUT pin), protection tripped
(OLP, OVP)
2.0
2.5
3.0
5
0.5
mA
UVLO(off)
5
5
5
8.0
9.0
15.0
28
10.0
16.5
29.5
V
V
V
UVLO(on)
14.0
26.5
OVP level on VCC pin
VOLTAGE FEEDBACK
Short circuit current, Vcomp = 0V
2
2
2
1.5
5.4
2.2
mA
V
Open loop voltage, COMP pin open
Green-mode threshold voltage
1.65
V
CURRENT SENSING
Maximum input voltage, Vcs (off)
4
4
4
4
0.85
1
0.9
0.95
V
nS
M
Leading edge blanking time
Input impedance
350
Delay to output
100
nS
OSCILLATOR
3
3
3
3
60
65
20
70
KHz
KHz
%
Frequency (RT = 100K )
Green mode frequency (RT = 100K )
3
3
Temp. stability
40°C ~ 110°C)
Voltage stability (Vcc = 11V ~ 25V)
%
GATE DRIVER OUTPUT
Output low level, VCC = 15V, Io = 20mA
6
6
6
6
6
1
V
V
Output high level, VCC = 15V, Io = 20mA
Rising time, load capacitance = 1000pF
Falling time, load capacitance = 1000pF
VGATE-clamp (VCC = 25V )
8
350
80
nS
nS
V
110
13
OLP
OLP trip level, Vcomp (OLP)
-
-
3.6
60
V
OLP delay time (note), Fs = 65KHz
mS
Note: Pin No. is only for SOT-26 package.
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
4
GR8835A
Typical Performance Characteristics
Fig.3
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
5
GR8835A
Typical Performance Characteristics (Cont.)
0.94
0.92
0.90
0.88
0.86
0.84
0
40
120 125
-40
80
Temperature (°C)
Fig. 9 OCP (V) vs. Temperature
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
6
GR8835A
Application Information
Start-up Current
Green-Mode Operation
The typical start-up current is 8uA. Very low
start-up current allows the PWM controller to
increase the value of start-up resistor and then
reduce the power dissipation on it.
When the load decreases to an extent, the
frequency of the controller will decrease so as to
reduce the system power consumption. The
minimum frequency is about 20 KHz, which is
outside the audio range
.
Under-voltage Lockout (UVLO)
A hysteresis UVLO comparator is implemented in
GR8835A, then the turn-on and turn-off thresholds
level are fixed at 15V and 9V respectively. This
hysteresis shown in Fig.13 ensures that the start-up
capacitor will be adequate to supply the chip during
start-up.
Leading-Edge Blanking (LEB)
Each time the power MOSFET is switched on, a
turn-on spike will inevitably occur at the sense
resistor. To avoid fault trigger, a 350ns leading-edge
blanking time is built in. Conventional RC filtering
can therefore be omitted. During this blanking
period, the current-limit comparator is disabled and
can not switch off the gate driver.
Internal Slope Compensation
A built-in slope compensation circuit is constructed
in GR8835A. When the switch is on, a ramp
voltage is added to the sensed voltage across the
CS pin, which helps to stabilize the system and
Fig.13
prevent sub-harmonic oscillations
.
Soft Start
Over-load Protection (OLP)
During initial power on, the GR8835A provides soft
start function. It effectively suppresses the start up
peak current to reduce the power MOSFET drain
voltage especially at high line.
The controller has over load protection function.
An internal circuit detects the load level, when the
load is larger than a threshold and the condition
lasts more than 60ms, the gate output will keep low
level. Then VCC decreases below UVLO off level,
the controller resets again. Fig.14 shows the
waveform of the OLP operation.
Oscillator
The maximum duty-cycle of internal oscillator is
limited about 75% to avoid the transformer
saturation.
The frequency of the oscillator is
decided by an external resistor connected from RT
pin to ground.
Fosc= 6500KHz/R (Kohm)
Where R is the resistor connected at RT pin.
A
100Kohm resistor results in 65KHz switching
frequency. The recommended range of oscillation
frequency is 50 KHz~130 KHz
.
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
7
GR8835A
Green-Mode Operation without Acoustic Noise
When the load decreases to an extent, the
switching frequency of the controller will decrease
so as to reduce the system power consumption. The
minimum frequency is around 20 KHz which is
outside the audio noise range. Fig.15 is the relation
between switching frequency and COMP pin
voltage.
When load reduce to light load, the COMP pin
voltage will also down to lower level. While COMP
pin voltage down to 0.8V the controller will shut
down the OUT pin to stop transfer the energy to
secondary. Then the COMP pin will rise slowly due
to no working of controller. If COMP pin rises to 0.9V,
the controller will start to switch again. This is called
the burst mode operation on light load for
improving the light load efficiency.
OVP (Over Voltage Protection) on VCC
To prevent power MOSFET from being damaged,
the GR8835A is implemented an OVP function on
VCC. When the VCC voltage is higher than the
OVP threshold voltage, the output gate driver circuit
will be shut down immediately to stop the switching
of power MOSFET.
When COMP pin between 1.1V to 1.65V, the
switching frequency is operating from 20KHz to
65KHz. This section is called the linearly
decreasing frequency mode for improving the
medium load efficiency.
The VCC OVP function is an auto-recovery type
protection. If OVP happens, the pulses will be
stopped and recover at the next UVLO on. The
GR8835A is working in a hiccup mode.
Gate Clamp/Soft Driving
Driver is clamped by an internal 13V Zener diode.
Those damages usually come from undesired
over-voltage gate signals. Under the conditions
listed below, the gate output will turn off immediately
to protect the power circuit. The GR8835A also
has soft driving function to minimize EMI.
Fault Protection
There are several critical protection integrated in the
. CS pin floating
. RT pin floating
Fig.15
. RT pin short to ground
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
8
GR8835A
Typical Application Circuit
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
9
GR8835A
Bom List
No.
1
Part.No
Description
X-CAP/0.22uF
E-CAP 400V/33uF
102/1KV
Note
No.
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
Part.No
R2
Description
Note
C1
SMD1206 / 105
SMD1206 / 754
SMD1206 / 754
SMD1206 /393
SMD1206 / 683
SMD0805 / 103
SMD0805 / 10R
SMD0805 / 68R
SMD0805 / 1003
SMD1206 / 2.7R
SMD1206 / 2.7R
SMD1206 / 3.9R
SMD1206 /22R
SMD1206 /22R
SMD0805 / 102
N.A.
2
C2
R3
3
C3
R4
4
C4
E-CAP 50V/10uF
Y-CAP CD222
SMD0805, 200V/222
E-CAP 25V/330uF
E-CAP 25V/330uF
E-CAP 25V/100uF
SMD0805,103
N.A.
R5
5
C5
R6
6
C6
R7
7
C7
R8
8
C8
R9
9
C9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
T1
1%
5%
5%
5%
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
C10
C11
CR1
CR2
CR3
CR4
CR5
CR6
CR7
CR8
F1
HER108
HER108
HER108
HER108
FR107
FR104
SMD0805 / 393
SMD0805 / 153
SMD0805 / 392
N.A.
SB5100
1%
1%
N.A.
250V/1.5A
HS1
L1
Heat Sink
EE25
1.4mH
GRT160905F403-N
GR0315-1R6M-N
2.5Ω
40mH
1.6uH
TVR1
U1
07471
L2
GR8835/35A
PC123
SOT-26
NTC1
Q1
U2
KHB4D5N60F
SMD1206 / 105
U3
GL431
R1
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
10
GR8835A
Package Information
SOT-26
SYMBOL
MILLIMETERS
INCHES
MIN.
MAX.
1.45
0.15
1.30
0.50
0.22
3.10
3.00
1.80
MIN.
MAX.
0.057
0.006
0.051
0.020
0.009
0.122
0.118
0.071
A
A1
A2
b
0.00
0.90
0.30
0.08
2.70
2.60
1.40
0.000
0.035
0.012
0.003
0.106
0.102
0.055
c
D
E
E1
e
0.95 BSC
1.90 BSC
0.037 BSC
0.075 BSC
e1
L
0.30
0o
0.60
8 o
0.012
0o
0.024
8 o
Note : 1. Followed from JEDEC TO-178 AB.
2. Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs
shall not exceed 10 mil per side.
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
11
GR8835A
Package Information
DIP-8
SYMBOL
MILLIMETERS
INCHES
MIN.
MAX.
5.33
MIN.
MAX.
0.210
A
A1
A2
b
0.38
2.92
0.36
1.14
0.20
9.01
0.13
7.62
6.10
0.015
0.115
0.014
0.045
0.008
0.355
0.005
0.300
0.240
4.95
0.56
1.78
0.35
10.16
0.195
0.022
0.070
0.014
0.400
b2
c
D
D1
E
8.26
7.11
0.325
0.280
E1
e
2.54 BSC
7.62 BSC
0.100 BSC
0.300 BSC
eA
eB
L
10.92
3.81
0.430
0.150
2.92
0.115
Note : 1. Followed from JEDEC MS-001 BA
2. Dimension D, D1 and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 10
mil.
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
12
GR8835A
Carrier Tape & Reel Dimensions
SOT-26
Application
SOT-26
A
H
T1
C
d
D
W
E1
F
8.4+2.00 13.0+0.50
178.0 2.00 50 MIN.
1.5 MIN. 20.2 MIN. 8.0 0.30 1.75 0.10 3.5 0.05
-0.00
-0.20
D0
P0
P1
P2
D1
T
A0
B0
K0
1.5+0.10
-0.00
0.6+0.00
-0.40
4.0 0.10
4.0 0.10 2.0 0.05
1.0 MIN.
3.20 0.20 3.10 0.20 1.50 0.20
(mm)
Application
SOT -26
Carrier Width
Cover Tape Width
Devices Per Reel
8
5.3
3000
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
13
GR8835A
Taping direction information
SOT-26
Direction of feed
Direction of feed
AAA
AAA AAA
AAA AAA AAA AAA
Grenergy OPTO, Inc. reserves the right to make corrections, modifications, enhancements, improvements, and other changes
to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the
latest relevant information before placing orders and should verify that such information is current and complete.
2011.02. Ver 1.5 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
14
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